<template>
  <div class="login-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" title="登录">
      <van-icon slot="left" name="cross" @click="$router.back()" />
    </van-nav-bar>

    <!-- 登录表单 -->
    <van-form @submit="onSubmit" ref="loginForm">
      <van-field name="mobile" v-model="user.mobile" placeholder="请输入手机号" :rules="userFormRules.mobile" type="number" maxlength="11">
        <i slot="left-icon" class="toutiao toutiao-shouji"></i>
      </van-field>
      <van-field name="code" v-model="user.code" placeholder="请输入验证码" :rules="userFormRules.code" type="number" maxlength="6">
        <i slot="left-icon" class="toutiao toutiao-yanzhengma"></i>
        <template #button>
          <!-- 倒计时 -->
          <van-count-down v-if="isCountDownShow" :time="1000 * 5" format="ss s" @finish="isCountDownShow = false" />
          <!-- 发送验证码按钮 -->
          <van-button v-else native-type="button" class="send-sms-btn" size="small" type="primary" @click="onSendSms">发送验证码</van-button>
        </template>
      </van-field>
      <div style="margin: 16px;">
        <van-button block type="info" native-type="submit">提交</van-button>
      </div>
    </van-form>
  </div>
</template>

<script>
import { login, sendSms } from '@/api/user'
export default {
  name: 'Login',
  data () {
    return {
      isCountDownShow: false, // 控制倒计时的显示和隐藏
      user: {
        mobile: '',
        code: ''
      },
      // 用户名和验证码校验规则
      userFormRules: {
        mobile: [
          {
            required: true,
            message: '手机号不能为空'
          },
          {
            pattern: /^1[3|5|7|8]\d{9}$/,
            message: '手机号格式错误'
          }
        ],
        code: [
          {
            required: true,
            message: '验证码不能为空'
          },
          {
            pattern: /^\d{6}$/,
            message: '验证码格式错误'
          }
        ]
      }
    }
  },
  methods: {
    // 表单提交事件
    async onSubmit (values) {
      console.log('submit-->', values)
      const user = this.user
      // 表单验证

      // 提交表单请求登录
      this.$toast.loading({
        message: '登录中...',
        forbidClick: true, // 禁用背景点击
        duration: 0 // 持续时间，默认是 2000，如果为 0 则持续展示
      })

      try {
        const { data } = await login(user)
        console.log('data==>', data)
        this.$store.commit('setUser', data.data)
        this.$toast.success('登录成功')
        // 登录成功以后，跳转到原来页面
        // back 的方式不严谨，后面我们会进行优化
        this.$router.back()
      } catch (error) {
        if (error.response.status === 400) {
          this.$toast.fail('手机号或验证码错误')
        } else {
          this.$toast.fail('登录失败，请稍后重试')
        }
      }

      // 根据响应结果处理后续操作
    },

    // 验证手机验证码
    async onSendSms () {
      // 1. 校验手机号
      try {
        await this.$refs.loginForm.validate('mobile')
      } catch (err) {
        return console.log(err)
      }
      // 2. 验证通过，显示倒计时
      this.isCountDownShow = true

      try {
        await sendSms(this.user.mobile)
        this.$toast('发送成功')
      } catch (error) {
        this.isCountDownShow = false
        if (error.response.status === 429) {
          this.$toast('发送太频繁了，请稍微重试')
        } else {
          this.$toast('发送失败，请稍后重试')
        }
      }
    }
  }
}
</script>
<style lang="less" scoped>

.login-container {
  .toutiao {
    font-size: 37px;
  }
  .send-sms-btn {
    width: 152px;
    height: 46px;
    line-height: 46px;
    background-color: #ededed;
    font-size: 22px;
    color: #666;
    padding:0;
  }
  .login-btn-wrap {
    padding: 53px 33px;
    .login-btn {
      background-color: #6db4fb;
      border: none;
    }
  }
}

/deep/ .van-button--primary {
  border-color: #1989fa !important;
}
</style>
